A Japanese brewery has come up with a novel way of keeping beer cool - a frozen head.

Kirin's Ichiban Shibori Frozen Draft features a frozen foam 'lid' which keeps the beer cold for about 30 minutes.

The foam is made by cooling the beer to -5C and then pumping it out soft serve ice cream style on top of the glass.

So far, it is only available in just over 20 bars in Tokyo and surrounding areas.

Maybe we'll have by summertime.  Cool.